84091665 has 16 divisors (see below), whose sum is σ = 153767808. Its totient is φ = 38441856.

The previous prime is 84091661. The next prime is 84091687. The reversal of 84091665 is 56619048.

It is not a de Polignac number, because 84091665 - 2² = 84091661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84091661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 400332 + ... + 400541.

It is an arithmetic number, because the mean of its divisors is an integer number (9610488).

Almost surely, 2^84091665 is an apocalyptic number.

It is an amenable number.

84091665 is a deficient number, since it is larger than the sum of its proper divisors (69676143).

84091665 is a wasteful number, since it uses less digits than its factorization.

84091665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800888.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 84091665 is about 9170.1507621195. The cubic root of 84091665 is about 438.1111610854. Note that the first 4 decimals are identical.

The spelling of 84091665 in words is "eighty-four million, ninety-one thousand, six hundred sixty-five".